<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
    <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="80px" class="login_form">
                <el-form-item label="用户名" prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <el-form-item label="密码" prop="password">
                    <el-input v-model="loginForm.password" type="password" show-password prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 这是登录表单的数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456'
            },
            //这是表单的验证规则对象
            loginFormRules:{
                username: [
                    { required: true, message: '请输入账户', trigger: 'blur' },
                    { min: 3, max: 5, message: '请输入账户（长度在 3 到 5 个字符）', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '请输入密码（长度在 6 到 15 个字符）', trigger: 'blur' }
                ]
            }
        };
    },
    methods:{
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
                if(!valid){
                    return;
                }
                //只取出data数据，并重命名为res
                const {data: res}= await this.$http.post("login",this.loginForm);
                if(res.meta.status !== 200){
                    //message弹框提示
                    return this.$message.error("登录失败!");
                }
                this.$message.success("登录成功!");
                // 将登录成功后的token保存到客户端的sessionStorage中
                console.log(res);
                window.sessionStorage.setItem("token",res.data.token);
                // 通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push('/home')
            });
        }
    }
};
</script>

<style lang="less" scoped>
    .login_container{
        background-color: azure;
        height: 100%;
    }
    .login_box{
        background-color: #fff;
        width:450px;
        height:300px;
        border-radius: 3px;
        position: absolute;
        left:50%;
        top:50%;
        transform: translate(-50%,-50%);
    }

    .avatar_box{
        height: 130px;
        width:130px;
        border:1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left:50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width:100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }

    }
    .login_form{
        position: absolute;
        bottom: 0;
        width:100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
</style>